A richly illustrated guide to the world of dinosaurs. An excellent example of a colorful and very informative children's encyclopedia, popularly telling about dinosaurs The world of dinosaurs is an amazing stage of life on Earth These amazing reptiles were perhaps one of the most successful and prosperous life forms that ever existed on our planet. The first dinosaurs appeared about 225 million years ago, during the Triassic period. During the Jurassic and Cretaceous periods, many new species arose. Dinosaurs turned into real giants and spread throughout the planet The diversity of these reptiles, which reigned on Earth for about 150 million years, is shocking: bipeds and quadrupeds, carnivores and herbivores, weighing only a few kilograms and many tens of tons? However, at the end of the Cretaceous period, about 65 million years ago, they all died out for an unknown reason. Recommended literature: Walking with Dinosaurs (Interactive Encyclopedia), Tony Sheldon, Jill Bailey. Prehistoric World (Oxford Library), Atlas of Dinosaurs and Other Fossil Animals. Joachim Opperman . Dinosaurs (What's What), by Marilis Lunkenbein . The Dinosaurs . My first encyclopedia